Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
Hawaii Islands
Italy
Discoverer
Unknown
Marcus Vitruvius Pollio
Etymology
From Greek pikros bitter + -ite, 19th century
From Italian travertino a kind of building stone, from Tiburs, adjective from Tibur (Tivoli), in Italy
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock